| Parameter | Setting (mm) | Purpose | |-----------|--------------|--------------------------------| | 1320 | -100000 | Negative software limit | | 1321 | +480000 | Positive soft limit 1 (warning)| | | +500000 | Positive soft limit 2 (final stop) |
What (e.g., 0i-F, 18i, 31i) is installed on the CNC tool?
Use FANUC’s Servo Guide software tool to chart the position error loops if available. If the tracking error spikes suddenly during acceleration changes, look for mechanical binding or axis lubrication failures before tweaking the loop gains. Summary Reference Table Feature / Detail Specification / Action Function
If the axis typically shows a following error of 10 μm when settling into position (as viewed on the servo monitor screen), a setting of (representing 30 μm or 0.030 mm) would provide a safety margin of 3×. fanuc parameter 1829
Any that occurred right before the issue started. Share public link
To help diagnose your specific issue, could you share you are using (e.g., 0i-D, 31i), the exact alarm code appearing on your screen, and whether this error happens during rapid travel or a cutting cycle ? Share public link
For smooth transitions and to prevent axis hunting or thumping, the values in Parameter 1825 and Parameter 1829 are usually kept identical for a given axis unless a highly specialized application requires otherwise. Symptoms of Improperly Set Parameter 1829 | Parameter | Setting (mm) | Purpose |
: On vertical axes (like Z), a failing motor brake can allow the axis to drop slightly when it's supposed to be locked, quickly exceeding the 1829 limit. Encoder or Cable Issues
Use FANUC’s #8000 series system variables to query the current search status dynamically—though not directly settable via macro, you can detect search failures and retry with a higher range.
Dirt, oil, or coolant on a linear scale or rotary encoder can cause intermittent pulse drops, tricking the control into reading an artificial position lag. Step-by-Step Diagnostic and Troubleshooting Workflow Summary Reference Table Feature / Detail Specification /
Ensure the automatic lubrication system is functioning and that the ways aren't dry Monitor Position Deviation: Use the CNC's Diagnosis Screen
The performance of Parameter 1829 is tied to its neighbors: 1826, 1828, and 1825.
Position deviation during a stop is larger than the value preset by Parameter No. 1829.